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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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1 <HTML
2 ><HEAD
3 ><TITLE
4 >SDL_SetGammaRamp</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
8 "><LINK
9 REL="HOME"
10 TITLE="SDL Library Documentation"
11 HREF="index.html"><LINK
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13 TITLE="Video"
14 HREF="video.html"><LINK
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16 TITLE="SDL_GetGammaRamp"
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23 BGCOLOR="#FFF8DC"
24 TEXT="#000000"
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26 VLINK="#551a8b"
27 ALINK="#ff0000"
28 ><DIV
29 CLASS="NAVHEADER"
30 ><TABLE
31 WIDTH="100%"
32 BORDER="0"
33 CELLPADDING="0"
34 CELLSPACING="0"
35 ><TR
36 ><TH
37 COLSPAN="3"
38 ALIGN="center"
39 >SDL Library Documentation</TH
40 ></TR
41 ><TR
42 ><TD
43 WIDTH="10%"
44 ALIGN="left"
45 VALIGN="bottom"
46 ><A
47 HREF="sdlgetgammaramp.html"
48 >Prev</A
49 ></TD
50 ><TD
51 WIDTH="80%"
52 ALIGN="center"
53 VALIGN="bottom"
54 ></TD
55 ><TD
56 WIDTH="10%"
57 ALIGN="right"
58 VALIGN="bottom"
59 ><A
60 HREF="sdlmaprgb.html"
61 >Next</A
62 ></TD
63 ></TR
64 ></TABLE
65 ><HR
66 ALIGN="LEFT"
67 WIDTH="100%"></DIV
68 ><H1
69 ><A
70 NAME="SDLSETGAMMARAMP"
71 >SDL_SetGammaRamp</A
72 ></H1
73 ><DIV
74 CLASS="REFNAMEDIV"
75 ><A
76 NAME="AEN1167"
77 ></A
78 ><H2
79 >Name</H2
80 >SDL_SetGammaRamp&nbsp;--&nbsp;Sets the color gamma lookup tables for the display</DIV
81 ><DIV
82 CLASS="REFSYNOPSISDIV"
83 ><A
84 NAME="AEN1170"
85 ></A
86 ><H2
87 >Synopsis</H2
88 ><DIV
89 CLASS="FUNCSYNOPSIS"
90 ><A
91 NAME="AEN1171"
92 ></A
93 ><P
94 ></P
95 ><PRE
96 CLASS="FUNCSYNOPSISINFO"
97 >#include "SDL.h"</PRE
98 ><P
99 ><CODE
100 ><CODE
101 CLASS="FUNCDEF"
102 >int <B
103 CLASS="FSFUNC"
104 >SDL_SetGammaRamp</B
105 ></CODE
106 >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE
107 ></P
108 ><P
109 ></P
110 ></DIV
111 ></DIV
112 ><DIV
113 CLASS="REFSECT1"
114 ><A
115 NAME="AEN1177"
116 ></A
117 ><H2
118 >Description</H2
119 ><P
120 >Sets the gamma lookup tables for the display for each color component.
121 Each table is an array of 256 Uint16 values, representing a mapping
122 between the input and output for that channel. The input is the index
123 into the array, and the output is the 16-bit gamma value at that index,
124 scaled to the output color precision. You may pass NULL to any of the
125 channels to leave them unchanged.</P
126 ><P
127 >This function adjusts the gamma based on lookup tables, you can also
128 have the gamma calculated based on a "gamma function" parameter with
129 <A
130 HREF="sdlsetgamma.html"
131 >SDL_SetGamma</A
132 >.</P
133 ><P
134 >Not all display hardware is able to change gamma.</P
135 ></DIV
136 ><DIV
137 CLASS="REFSECT1"
138 ><A
139 NAME="AEN1183"
140 ></A
141 ><H2
142 >Return Value</H2
143 ><P
144 >Returns -1 on error (or if gamma adjustment is not supported).</P
145 ></DIV
146 ><DIV
147 CLASS="REFSECT1"
148 ><A
149 NAME="AEN1186"
150 ></A
151 ><H2
152 >See Also</H2
153 ><P
154 ><A
155 HREF="sdlsetgamma.html"
156 >SDL_SetGamma</A
157 >
158 <A
159 HREF="sdlgetgammaramp.html"
160 >SDL_GetGammaRamp</A
161 ></P
162 ></DIV
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164 CLASS="NAVFOOTER"
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166 ALIGN="LEFT"
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173 ><TD
174 WIDTH="33%"
175 ALIGN="left"
176 VALIGN="top"
177 ><A
178 HREF="sdlgetgammaramp.html"
179 >Prev</A
180 ></TD
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182 WIDTH="34%"
183 ALIGN="center"
184 VALIGN="top"
185 ><A
186 HREF="index.html"
187 >Home</A
188 ></TD
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190 WIDTH="33%"
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192 VALIGN="top"
193 ><A
194 HREF="sdlmaprgb.html"
195 >Next</A
196 ></TD
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198 ><TR
199 ><TD
200 WIDTH="33%"
201 ALIGN="left"
202 VALIGN="top"
203 >SDL_GetGammaRamp</TD
204 ><TD
205 WIDTH="34%"
206 ALIGN="center"
207 VALIGN="top"
208 ><A
209 HREF="video.html"
210 >Up</A
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216 >SDL_MapRGB</TD
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222 >